论文标题
对双β衰减和暗物质引起的铂的过程的更新和新颖的限制
Updated and novel limits on double beta decay and dark matter-induced processes in platinum
论文作者
论文摘要
在意大利（意大利）实验室nazionali del Gran Sasso（意大利）进行了510天的长期测量，对超低纯净锗探测器的45.3 G铂箔充当样品和高电压接触。该数据用于自然铂同位素中双β衰变模式的详细研究。限制设置为$ \ MATHCAL {O}（10^{14} -10^{19}）$ yr（90％c.l.），用于几个双重β衰变过渡到确认的激发态，并部分扩展了现有限制。对于同位素的两个中微子和中微子双β衰变模式，达到了测量的最高灵敏度，大于$ 10^{19} $ yr。此外，$^{195} $ pt上无弹性暗物质散射的新颖限制归功于大约500 keV的质量分裂。我们分析了几种技术以扩展灵敏度，并提出了一些用于将来使用铂类元素进行的中等规模实验的方法。
A 510 day long-term measurement of a 45.3 g platinum foil acting as the sample and high voltage contact in an ultra-low-background high purity germanium detector was performed at Laboratori Nazionali del Gran Sasso (Italy). The data was used for a detailed study of double beta decay modes in natural platinum isotopes. Limits are set in the range $\mathcal{O}(10^{14} - 10^{19})$ yr (90% C.L.) for several double beta decay transitions to excited states confirming, and partially extending existing limits. The highest sensitivity of the measurement, greater than $10^{19}$ yr, was achieved for the two neutrino and neutrinoless double beta decay modes of the isotope $^{198}$Pt. Additionally, novel limits for inelastic dark matter scattering on $^{195}$Pt are placed up to mass splittings of approximately 500 keV. We analyze several techniques to extend the sensitivity and propose a few approaches for future medium-scale experiments with platinum-group elements.
